pH Dependence of adsorption of alkyl maltoside on solids

COLL 6

Shaohua Lu, sl2287@columbia.edu, Department of Earth and Environmental Engineering, Columbia University, Room 911 Mudd Building, 500 West 120th St, New York, NY 10027, Ponisseril Somasundaran, ps24@columbia.edu, Industry/University Cooperative Research Center for Surfactants, Columbia University, 500 W 120th Street, 910 S.W. Mudd, New York, NY 10027, and Jun Wu, jw2613@columbia.edu, Earth and Environmental Engineering, Columbia University, 500 West 120th St #918, New York, NY 10027.
Alkyl maltosides are representative of biodegradable surfactants produced from renewable resources and find use in many industrial operations such as separation, lubrication, flotation, dispersion and enhanced oil recovery due to their special interfacial and colloidal properties In this work, adsorption of a typical alkyl polyglucoside, n-dodecyl-β-D-maltoside (DM), on solids was studied to explore the mechanisms involved in their unique behavior: significant adsorption on alumina, hematite and titania but not on silica. Also the adsorption was pH dependent even though it is a nonionic surfactant, Our results showed adsorption to be proportional to the concentration of surface –AlOH species but independent on that of –Al(OH2)+ and –AlO- species. Similar correlation was also found in the case of adsorption on hematite. The mechanism accounts for the preferential adsorption of n-dodecyl-β-D-maltoside on alumina, titania and hematite over silica. In addition, the adsorption behavior of mixed n-dodecyl-β-D-maltoside and sodium dodecyl sulfonate was investigated to identify synergism/antagonism in the adsorbed layer on alumina. These results have implications to the many industrial applications of sugar based surfactants.
 

Surfactants from Renewable Resources
9:00 AM-12:20 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 225, Oral

Division of Colloid & Surface Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008